This has to do with with the mixture of honeys and apples being associated with Vermont in Japan, though I'm not quite sure how wildly known that is or why.
It's because there was a book called "Folk Medicine: A Vermont Doctor's Guide to Good Health" that kicked off a health fad called the "Vermont health system" in Japan. It included drinking apple cider vinegar and honey. The curry then appropriated the name for its health connotations.
You can get a similar vibe out of golden curry by peeling and pureeing a couple apples. I add them after the onions get soft and fry some moisture out of them before the water and tubers go in.